My client is creating pages in English and Welsh using the following workflow:
-Create / save page in English version of the CMS
-Change to Welsh CMS, re-open page, add content and save
They are editing pages as follows:
-Make edit in English version of page and save
-Switch to Welsh language and re-open page - make edits and save
When they edit the english language version of an already-published page some content in the Welsh version is being deleted automatically. Usually this is custom field content that displays as extra content blocks on the page.